Excitation dependent tunable emission colour of Eu3+-Tb3+ co-doped titanium zinc sodium phosphate glass

1 mol% Eu2O3 + 1 mol% Tb2O3 + 4TiO2 + 14ZnO + 20Na2O + 60P2O5 co-doped glass has been synthesized by the melt quenching technique to investigate the optical and structural properties. The structural features are examined by XRD and FTIR spectra, and the spectroscopic properties are explored by absorption, excitation, emission, decay and CIE diagram. Upon excitation at 341 nm (Tb3+ band) luminescence emission transitions of both Tb3+ and Eu3+ are observed, however, for excitation at 393 nm (Eu3+ band), only Eu3+ emissions are noticed which indicate the evidence of energy transfer from Tb3+ to Eu3+ by non-radiative relaxation process. The decay profile of the glass follows double exponential function. The emission color of the sample characterized by the CIE chromaticity coordinates and CCT, are tuned by varying the excitation wavelength. The present glass could be utilized in W-LED for 341 nm excitation, display devices and photonics.

Automated summary

The optical and structural properties of glass co-doped with different percentages of Eu2O3, Tb2O3, TiO2, ZnO, Na2O, and P2O5 have been investigated. The study includes analysis of XRD, FTIR spectra, absorption, excitation, emission, decay, and CIE coordinates. The glass shows luminescence emission transitions of Tb3+ and Eu3+ upon excitation at 341 nm, indicating energy transfer from Tb3+ to Eu3+ through non-radiative relaxation process. The emission color can be tuned by varying the excitation wavelength, making the glass suitable for applications in WLED, display devices, and photonics.